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GLOCK MOS3 Leupold DPP LowWitness Rear Sight
The GL-MOS3-DPP-Rear was designed specifically for the GLOCK MOS3 Direct Milled DPP plate. This plate requires a .405 Front sight to properly Low Witness. CHPWS along with many other instructors within the MRDS community are huge advocated of what we call LowWitness. LowWitness is defined as a BUIS (Back Up Iron Sights) that sits between .075″ to .100″ into the optic FOV (Field Of View) which is equivalent to lower 1/6 to lower 1/8.
Red Dot Industry Experts believe BUIS (Back Up Iron Sights) should not block your FOV. True Co-Witness blocks half your FOV and Lower 1/3 blocks one third of your FOV. Why would you spend hard earned money to buy a quality red dot and then block most of your FOV with iron sights that are only used in case of emergency?